Protobuf partial paths aren't expanded during

# What happened?

The new parser implementation enabled the Protobuf parser to accept also files with non-fully specified path. Unfortunately we don't have a process of normalization of the protobuf schema, so basically we aren't managing correctly the schema evolution for the import reordering, the partial path shrinking or expansion.
I've created [this draft](https://github.com/Aiven-Open/karapace/pull/739) containing a set of tests that the schema evolution part for protobuf should pass to be considered correct